Bayern Munich clearly cannot underestimate the current Arsenal, and in my opinion don't expect a goal massacre like before because Bayern Munich squad is no longer ideal, even though Harry Kane is there, it's still not enough to silence Arsenal under Arteta control. I guarantee that this match will be very difficult for Bayern Munich to control, and Muller, who always underestimates his opponent, this time has to take back his words. For many people Arsenal may not be the favorite, but statistically the Arsenal squad playing at home is in a positive trend.
The teams currently competing in the Champions League quarter-finals are the best teams and I am quite sure that none of the teams will underestimate their respective opponents, especially if they are not teams that often meet in the Champions League because of course they don't have a clear idea of what the team they are facing is like. and Arsenal is not a team that often plays in the champions league so for Bayern Munich their opponent is quite difficult to assess their game so anything can happen, but I predict that Bayern Munich has a better chance of getting to the semifinals because Arsenal is proving to be quite difficult in the match against the Porto team which is predicted to be easy. eliminated by Arsenal, especially facing Bayern Munich, a team that is very enthusiastic because this is the only competition where they still have a chance to win the title and even though they are no more favorites than Manchester City, Real Madrid and even Arsenal too, I see them still have the opportunity to become a surprising team
honestly, I doubt Arsenal but I don't underestimate their luck and the reason I say about luck is because we all remember when we beat Porto it wasn't purely based on the score we got when the match started but we got the win and qualified for the quarter finals when we beat Porto with the aggregate score in the penalty round.
that's why I said that doubting Arsenal is very reasonable but don't doubt his luck because in the UCL anything can happen as you said.
but literally Bayern Munich has a very big advantage in having very great players and experience in the UCL so I would say that if Arsenal in the quarter finals can only wait for luck to come again and if luck doesn't come again, it will definitely be in the second leg of Bayern Munich will score a bigger aggregate score like in the past few seasons.